An electron travels to the right, as shown in the figure below, starting in a region of zero magnetic field, and then entering a region of uniform magnetic field, pointing into the page, with a magnitude of
b = 1.45 mT.
(a)
Once the electron enters the region of nonzero magnetic field, it travels in a complete semicircle before exiting the region of field again. (That is, it exits the region moving to the left.) How long (in s) is the electron in the region of nonzero field?
s
(b)
The electron penetrates a maximum depth of 3.15 cm into the region of nonzero field. What is the kinetic energy (in eV) of the electron?
eV

The extremely high temperatures needed to trigger nuclear fusion are proposed to be generated by laser irradiating a spherical pellet of deuterium and tritium fuel of diameter 1.8 mm. (a) determine the maximum fuel temperature that can be achieved by irradiating the pellet with 200 lasers, each producing a power of 550 w. the pellet has an absorptivity 0.3 and emissivity 0.8.

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.